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how to convert voltage reading from DAQ to physical value?

Below is the example VI from labview,


my question is, how to convert voltage reading to physical meaning, I multiply the data by 15 but the graph indicator still show voltage value, I tried differenrt data type but couldnt do it. I know my method is wrong, but can anyone help me fix my error? thanks

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The simplest would be to create a custom DAQmx scale in MAX and then tell DAQmx to use that scale when adding the channel to the task (input is on the buttom of the Create Channel VI).

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